Improvement in grate-backs



W. AQHVOLBROOK. GRAN-BACK.

n No. 193,514. K Patented .my 24,1877.

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WALTER A. HOLBROOK, OF MILWAUKEE, WISCN SIN.

IMPROVEMENT IN GRATE-BACKS.`

Specification forming part of Letters Patent No. E93,5l4, dated July 24,1877 application filed r mme' 9, 1877.

To all whom it may concern:

Be it known that I, WALTER A. HoLBRooK, of Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented a new and valuableImprovement in Grate-Backs; and I do hereby declare that the followingis a full, clear, and exact description of the construction andoperation of the same, reference being had to the annexed drawings,making a part of this specification, and to the letters and figures ofreference marked thereon.

Figure 1 of the drawings is a representation of a vertical centralcross-sectional view of my invention, and Fig. 2 is a horizontalsectionthereof.

This invention has relation to improvements in gratcs.

The object of the invention is to devise means for utilizing the heatfrom theback and sides of an ordinary open tire-place, usually wasted bypassing into the brick or up the chimney-due.

This invention consists in the construction and novel arrangement of aconcave cast-irongrate-back having an inclined top and lianges on themargins of the sides and top, and, in

' connection therewith, of the sheet-metal jackin Fig. 2, and providedat their front edges with a flange, b, while the top is carried upwardand backward from the throat b in a preferably inclined position to formthe top t of the air-chamber U. This latter is formed by agalvanized-iron jacket, D, the sides of which are at right angles, ornearly so, to the back, and are secured to the grate-back flange b bymeans of bolts c passing through registering eyes respectively in theanges of the grate-back and jacket. The flange b is first filled withstove-putty, and when. the flange of the jacket is bolted thereto aclose. joint is formed which eectually prevents gas or smoke frompenetrating into the air-chamber aforesaid. The jacket is provided witha number of projecting shelves, E, obliquely arranged at differentheights, the object of which is to retard the air in its upward coursesu ciently long to be well heated.

Air may be introduced into the chamber C through a pipe or conduit, F,from a room below, or from any suitable point, and after being properlyand thoroughly heated passes out of the said chamber through a pipe, G.This latter in the drawings is shown opening into an adjacent room 5 butby the use of proper connections and iues the heated air may bedischarged into a room or rooms above, and even conducted back into theapartment where the grate is.

By the employment of proper registers the supply of hot air dischargedfrom the chamber may be regulated at pleasure.

The combined grate-back and air-ch-amber jacket will be set into thelire-place in'the usual manner, but entirely independent of the frame,so that they will contract or expand without danger of breaking.

The frame A is secured in any suitable Inanner to the lire-place front,and forms with the upper end of the back a throat, b', through which theproducts of combustion pass into the due J with adequate draft. Thislatter is regulated through the medium of a damper, I, that works inspaced lugs or eyes i cast on the top plate tot' the back.

' One of' these eyes is open, so that the dampy er may be removed whennecessary, and the said damper is provided with a hook', n, by means ofwhich it may be conveniently operated with a poker.

The `grate-back, with its sides and inclined top plate, is cast inOnepiece, and as the jacket forms an air-tight joint therewith thepenetration of smoke and gas into the chamber C is absolutely prevented.

In practice, the back will be bedded in mortar upon the hearth, thecollar G upon the4 jacket being engaged in the flue opening into theroom to ybe warmed.

What I claim as new, and desire to secure by Letters Patent, is-

l. The hollow grate-back, consisting of th@ concave cast-iron plate A,having the top t inclined backward and upward from its upper bend, andange b extending around its side and top edges, and the laterally-bentiron jacket D, having a corresponding side ilange, v

and bolted to the sides and top of said plate, substantially as specied.

2. The combination, with the concave corrubolted thereto, and having theseries of inner projecting ledges obliquely arranged at differentheights, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

WALTER A. HOLBROOK. Witnesses:

J. C. FINoH,

GEO. H. NoYEs.

